VMS Help PASCAL, Lexical Elements, Identifiers, User Defined Identifiers  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  User identifiers denote the names of programs, modules, symbolic
  constants,  variables,  procedures, functions, program sections,
  and  user-defined  types.   They  represent   significant   data
  structures,  or  values  and actions that are not represented by
  reserved words, predeclared identifiers, or special symbols.